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I'm on my 3rd one, replaced twice under warranty. Both times it died in my tool bag, no drops, decently protected when stored.
It's ok for walk around readings, but the insertion depth is to short for it to be useful for in duct measurements through a test hole.

My advice is to either get a SRH3 or SDP2, or get a Testo 605-H2, and secure the battery door with tape.

I'm on my 3rd one, replaced twice under warranty. Both times it died in my tool bag, no drops, decently protected when stored.
It's ok for walk around readings, but the insertion depth is to short for it to be useful for in duct measurements through a test hole.

My advice is to either get a SRH3 or SDP2, or get a Testo 605-H2, and secure the battery door with tape.

Would the depth of the sensor make a noticable difference in wet bulb readings?

Would the depth of the sensor make a noticable difference in wet bulb readings?

If you can't get far enough into the duct to get past the boundary layer of air, into the actual air stream, none of the readings you get mean much of anything.

Due to the stupidity we have here in Texas of ducts and air handling equipment installed in attics, especially furnaces with uninsulated blower compartments, I frequently run into situations where I can't really get good coil entering air readings with an instrument that has a 5" insertion, like the Testo 605-H2 Humidity sticks, so I'm ordering a Fieldpiece SDP2.

Your probably right. The price is right and I like the idea ofkeeping it handy in my shirt pocket but, I might just hold off and get a quality psychrometer.

Unless you have Jolly Green Giant size shirt pockets, it doesn't work as a "pocket tool," the inclusion of a pocket clip on it is comical.

You can't even keep it in your pants pocket really.
Instead of making it so the aluminum protective cap screws onto the aluminum body, so it would be like one rigid tube, they made is so the cap threads onto the base of the plastic probe part, which is glued into the end of the aluminum tube that acts as the housing. If you put it in your pants pocket, and sat down, chances are the probe end would break right off, protective cap and all.

It's one of those tools that was a great idea, but poorly implemented for field use.

Now that I've savaged it over its physical shortcomings, I have to say that I like that it will do Dewpoint and wet bulb calculations. I'll never understand why Testo didn't make the 605 do both, instead of making 2 separate instruments.
The sensor in it is also quite accurate, at least as good as any others I've used that were under the $500 range.